I have an 18 year old GE Potscrubber 830 that has served us well over the years. Recently, though, it has stopped cleaning and there is always detergent remaining in the dispenser with the door (the door does open). I ran the washer empty and, when opening it, found very little water in the pan. In listening to it, it seemed that as soon as water was sprayed into the washer, it was pumped out fairly quickly. Following a thread I found online, I filled the pan with water to just under the element and pointed both spray arms forward (to test the water valve). Almost as soon as I started the wash cycle, the d/w began draining the water. When I opened the washer midway through the drain, neither of the spray arms had moved but there was water noticeable in the opening of the bottom one. The center spray tower had not risen. Admittedly not knowing what I'm talking about, it seemed that there was enough water in the pan for enough time to have started the spray arms rotating. Does this sound like a water valve issue or more of a pump issue? Is there something else I should try? Finally, considering that the d/w is 18 years old, does it make sense to repair it? Thanks for any advice you can offer.